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Cephalopods in the diet of nonbreeding black-browed and grey-headed albatrosses from South Georgia

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The food and feeding ecology of albatrosses during the nonbreeding season is still poorly known, particularly with regard to the cephalopod component. This was studied in black-browed Thalassarche melanophris and grey-headed T. chrysostoma albatrosses by analysing boluses collected shortly after adults returned to colonies at Bird Island, South Georgia (54°S, 38°W), in 2009. Based on stable isotopic analyses of the lower beaks, we determined the habitat and trophic level (from δ13C and δ15N, respectively) of the most important cephalopods and assessed the relative importance of scavenging in terms of the albatrosses’ feeding regimes. Based on lower rostral lengths (LRLs), the main cephalopod species in the diets of both albatrosses was Kondakovia longimana, by frequency of occurrence (F > 90 %), number (N > 40 %) and mass (M > 80 %). The large estimated mass of many squid, including K. longimana, suggests that a high proportion (>80 % by mass) was scavenged, and that scavenging is much more important during the nonbreeding season than would be expected from breeding-season diets. The diversity of cephalopods consumed by nonbreeding birds in our study was similar to that recorded during previous breeding seasons, but included two new species [Moroteuthis sp. B (Imber) and ?Mastigoteuthis A (Clarke)]. Based on similarities in LRL, δ13C and δ15N, the squid consumed may have been from the same oceanic populations or region, with the exception of Taonius sp. B (Voss) and K. longimana, which, based on significant differences in δ15N values, suggest that they may have originated from different stocks, indicating differences in the albatrosses’ feeding regimes.

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Acknowledgments

We are grateful to Derren Fox, Stacey Adlard and Ewan Edwards at Bird Island research station for helping with sample collection in winter 2009, and Janet Silk for creating Fig. 1.This research was supported by the Ministry of Science and Higher Education, Portugal (Fundação para a Ciência e a Tecnologia), the British Antarctic Survey and the Tinker Foundation, under the research programs CEPH, SCAR AnT-ERA, PROPOLAR and ICED. This study represents a contribution to the Ecosystems component of the British Antarctic Survey Polar Science for Planet Earth Programme, funded by The Natural Environment Research Council.

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Correspondence to Pedro M. Alvito.

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Alvito, P.M., Rosa, R., Phillips, R.A. et al. Cephalopods in the diet of nonbreeding black-browed and grey-headed albatrosses from South Georgia. Polar Biol 38, 631–641 (2015). https://doi.org/10.1007/s00300-014-1626-3

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